Circutor EMK Series, Инструкция по эксплуатации, Страница: 15 / 20

EMK series
Instructions Manual M98118701-03-19A 15
7
MAINTENANCE
7.1 Safety regulation
Keep in mind the safety regulations listed in section 2 of this manual before
operating the equipment.
The standards, National Electric Code, and applicable laws of the country where
the capacitor bank is to be installed or operated should be strictly followed.
7.2 Maintenance with the capacitor bank disconnected
7.2.1 Basic maintenance protocol
Monthly
• Visually inspect the capacitors
• Check the protection fuses
• Control the environmental temperature (average of 30 ºC. In accordance with IEC 60831 ).
• Control the supply voltage (especially during periods of low load, it must not exceed the
nominal value +10%).
Six-monthly
• Keep the capacitor terminals clean.
• Check that the thyristors are not short-circuited. To do so, cut the regulator's power supply and
check that there is no current in any of the capacitor phases.
• Check that the capacitor currents, in any of the phases, is not lower than 75% neither
greater than 120% of the rated value. Check also that there is no a phase unbalance greater
than 15%.
Annually
• Check the capacitor's microfarads of the different steps. An indirect verification can be
performed by checking that the consumption matches the value stated in Table 7.4, with a
maximum deviation of ± 10%.
• Check the tightness of all terminal connections on the different power elements.
• Inspection of the fuses.
- Power circuit: NH fuses. Check continuity and temperature.
- Control Circuit: Uni-polar circuit breaker, check continuity and temperature
7.2.2 Fuses inspection.
• The fuses and fuse bases should not be blackened and their connections must be tight. The
tightening torques for fuse bases are as indicated in the table below:
Table 7-1.- Tightening torques of the power cables to the fuse bases
FUSE BASE TORQUE (Nm)
NH-00 15.2
7.2.3 Key points for inspecting static switches.
• Check that the plastic parts are not blackened and do not show signs of burning or hardening.
• Check that the head is properly inserted
• Check the tightness of cables and terminals, as shown in table 7-2
• The terminals must be clean.
• In dirty environments (dust, sawdust, metal trimmings, etc.). Vacuum the dust and solid
remains regularly. There is no estimated time frame for cleaning, it depends on the amount of
dirt that penetrates the capacitor bank's cabinet.